As the “root” and “pulse” of the formation and development of the spiritual pedigree of the Communist Party of China, the great spirit of Party building has rich moral implications, highlighting the goodness and justice of human nature. The ceaseless inheritance, implementation and development of the great spirit of Party building must rely on the power of ethics and morality, and give full play to the initiative and creativity of the people. The moral dimension of great Party building spirit mainly has four levels. First, adhering to the truth and ideals is the moral belief of great spirit of Party building. Second, practicing the original aspiration and taking on the mission is the moral practice of the great spirit of Party building. Third, not being afraid of sacrifice and fighting bravely is the moral will of the great spirit of Party building. Fourth, being loyal to the Party and being irresponsible to the people is the moral value orientation of the great spirit of Party building. The four levels are not separated from each other, but a moral whole with rigorous structure and strict logic. The moral factor contained in the great spirit of Party building is an important motivation to support and promote the CPC to lead the people to achieve successive victories in the great practice of revolution and construction periods, and an important content that cannot be ignored to explore the internal logic of the overall context and picture of the century-old party history of the CPC.